Reamer body



Aug. l, 1939. o. HAMMER BEAMER BODY A Filed Sept. 22, 1937l 11 10 16i... -..L l@

A 2z "26 20 Y 35 azz, 12 16 52" z5 33'/ 3,4 P Fig; 5 16 36 M vw- F A M 4@ff/f, V: 2g 25' 25 l' 35 FIQ. 4 p' 36 35 I Inventor. 10 A. Otto Hammer11 B37 w i Horneys.

Patented Aug. 1, 1939 UNITED STATES PATENT OFFICE REAMER BODYApplication september 22, 1937, serial No. 165,148

11 Claims.

This invention relates to improvements in Well reamers, and particularlyto the bodies for such well reamers.

Heretofore, a highly successful reamer has been developed having astructure similar to that disclosed in Reissue Letters Patent No. 19,339issued to John A. Vertson. In such constructions a steel reamer body isprovided which is incorporated in the drill string, -this reamer bodycarrying rotatable cutters which are rotatable about laterally inclinedaxes when viewed in front elevation. The construction of these reamerbodies is somewhat expensive and sometimes diiculty is encountered inincorporating these reamer bodies at the desired position in the drillstring.

It is an object of the present invention to provide an improved reamerbody which may or may not incorporate the reamer design as disclosed inthe Vertson patent, and which can be clamped at any desired locationaround the drill pipe. In this Way the cost of the reamer body may bematerially reduced and the reamer may be positioned Wherever desired.

Y It is another object Vof the invention to provide an improved reamerconstruction wherein the body of the reamer is formed of two opposedparts adapted to be positioned in encircling relation around the drillpipe, two adjacent sides of the parts being hingedly connected by acutter pin so that the cutter pin serves two functions, .namely to hingethe parts together and to provide an axis about which its replaceablecutter may rotate.

A further object of the invention is to provide novel, simple, anddurable means for so mounting the reamer body on a drill pipe as toprevent rotation of the reamer body relative to the drill pipe duringreaming.

With the foregoing and other objects in view which will be made manifestin the following detailed description and specically pointed out in theappended claims, reference is had to the accompanying drawing for anillustrative embodiment of the invention, wherein:

Figure 1 is a View in front elevation of the improved reamer embodyingmy invention;

Fig. 2 is a view in rear elevation of the improved reamer embodying theinvention;

Fig. 3 is a horizontal section taken substantially upon the line 3-3upon Fig. 1;

Fig. 4 is a partial view in vertical section taken substantially uponthe line 4-4 upon Fig. 3, illustrating the means of holding the reamerbody against rotation relative to the drill pipe;

Fig. 5 is a view in vertical section illustrating (Cl. Z55-73) analternative means for holding the reamer body against rotation upon adrill pipe; and l Fig, 6 isa partial view in vertical sectionillustrating another means for holding the reamer body against rotationrelative to the drill pipe.

Referring to the accompanying drawing Wherein similar referencecharacters designate similar parts throughout, the improved reamerco-mprises two opposed semi-cylindrical parts I0 and II adapted to bepositioned in an encircling arrangement around a drill pipe P. The backof part I0 is equipped with knuckles I2 and I3 and similarly the back ofpart I I is provided with knuckles I4 and I 5.' A cutter pin I6 extendsthrough these knuckles and serves to hingedly,

connect parts I0 and II together at theirgbacks. l'

Between the knuckles the walls of the two parts I0 and II are recessedas indicated at I'I and I8. These recesses cooperate to form an openingthrough the body at the back thereof for affording clearance for therotatable cutter I9 which is rotatable on cutter pin I6 between washers20. Part I0 of the body is also provided with top and bottom bosses 2|and 22 through which extends a cutter pin 23 on which is rotatable acutter 24. This part is formed with an opening 25 therethrough toaccommodate the cutter. Similarly, part I I is equipped with top andbottom. bosses 26 and 21, a cutter pin 28, and a cutter 29. The openingin the body for this cutter is indicated at 30. The forward sides of thetwo parts Ill and II are provided with ears indicated at 32 throughwhich draw bolts V33 extend which are tightened by nuts 34 so as to drawthe two parts I0 and II together into clamping engagement around thedrill pipe. Additional ears may be provided as indicated at 32a adaptedto receive a locking pin 32h for locking parts I0 and I I againstopening while in the well in the event that'draw bolts should break orbecome unfastened. Y

p I have illustrated the cutter arrangement on the body as having thedesign embodied in the Vertson patent above-mentioned, wherein thecutter pins are arranged on laterally inclined axis. The cutters I9, 24,and 29 are transversely toothed and are of general barrel-shapedconfiguration. When the cutter pins and cutters are so arranged the rearcutter pin II being laterally inclined forms an inclined hingeat theback of the body and similarly the forward edges on which the ears 32are located are laterally in- Y clined. It will be understood, however,that the present invention is in no way restricted to the use oflaterally inclined cutter pins or cutters but lili may be used inconjunction with other cutter arrangements.

Means is provided for preventing rotation of the reamer body relative tothe pipe P during reaming. To this end, the reamer body may be equippedas illustrated in Fig. 4. The interior of the top and bottom of thereamer body formed by the two parts l and Il is annularly recessed asindicated at 35, each annular recess receiving one-half of a segmentalrubber ring 35. The ring formed by the halves of the rubber ring is madeslightly thicker than the depth of the recess so that it will projectinwardly and engage the pipe P. Preferably, the interior and exteriorsurfaces of each ring are knurled or otherwise formed so as to presentstrong friction surfaces.v By means of this construction, when the partsof the body are clamped about the pipe P the rubber ring at the top andbottom of the body will be compressed into firm engagement with the pipeP and with the backs of the recesses forming a strong grip which willresist rotation of the reamer body relative to the pipe.

In Fig. 5 I have illustrated an alternative form of construction forpreventing rotation of the body relative to the pipe. As illustratedtherein, the top and bottom of the reamer body are recessed as indicatedat 38 and 39. These recesses receive the edges of a split metal ring.The interior surfaces ci these segmental metal rings indicated at 4G and4I are knurled so as to tightly grip the drill pipe and the exteriorsurfaces of these rings are threaded with 0pposed threads. Inasmuch asthe conventional direction of drilling is toward the right, thedirection of the thrust imposed upon the body during reaming is in theopposite direction. Consequently, the upper ring dll has exteriorright-hand threads formed thereon and the lower ring 4I has exteriorleft-hand threads formed thereon. The backs of the recesses 38 and 39are threaded complementarily thereto. I prefer to have the rings taperedas shown. With this arrangement rotation of the body of the reamerrelative to the rings and tc the drill pipe merely serves to screw therings toward the center of the body causing them to tightly grip on thedrill pipe and when a sufficient grip has been established furtherrotation of the body relative to the rings is prevented by the opposedthreads. Suitable cap screws 42 may be used for holding the split ringsin position Yuntil the body 'nas been mounted upon the drill pipe. Thesecap screws are then removed.

Still another manner of preventing rotation of the reamer body relativeto the drill pipe is illustrated in Fig. 6. In this construction the topand bottom of the reamer body is recessed with a tapered recess asindicated at i3 toreceive the halves of segmental rings 44. These halvesof each segmental ring are preferably wedge-shaped in cross-section asshown. The recess 43 is formed eccentrically with respect to the drillpipe P and the segmental'ring `at the top and at the bottom is similarlyformed so as to t the eccentric recess. The interior surfaces of therings 44 are knurled so as to grip upon the drill pipe.

y place such as by set screws 45.

faces tting complementary eccentric surfaces at the back of the recess43, the body tting around the drill pipe and also these eccentricsurfaces cannot rotate relative to the drill pipe.

From the above described construction it will be appreciated that acheaper reamer construction is provided wherein the amount of materialin the body is materially reduced. At the same time the advantages ofany preferred reamer design may be retained. The reamer body may begripped at any desired position on the drill pipe and can be rmly heldagainst rotation relative thereto.

Various changes may be made in the details of the construction withoutdeparting from the spirit or scope of the invention as defined by theappended claims.`

1. A reamer comprising opposed parts adapted to be placed in encirclingrelationship around a drill pipe, a cutter pin hingedly connecting saidparts together, a cutter rotatable upon the cutter pin, and means forpreventing rotation oi said parts relative to the drill pipe.

2. A reamer comprising opposed body parts adapted to be placed inencircling relationship around a drill pipe, cutter pins mounted uponsaid parts and laterally inclined with respect to the axis of the drillpipe, one of said cutter pins serving to hingedly connect two adjacentsides of said body parts together, cutters rotatable upon said cutterpins, means for drawing the other two sides of the body parts together,

and means for preventing rotation oi the body parts relative'to thedrill pipe.

3. A reamer comprising two body parts hingedly connected together, meansfor drawing the free ends of the body parts together into clampingengagement with the drill pipe, reamer cutters mounted upon said bodyparts, means for preventing rotation of the body parts relative to thedrill pipe comprising knurled rubber segmental rings recessed in the topand bottom of the body adapted to be compressed between the drill pipeand the body upon tightening the body.

1i. A reamer comprising two body parts hingedly connected together,means for drawing the free ends of the body parts together into clampingengagement with the drill pipe, reamer cutters mounted upon said bodyparts, means for preventing rotation of the body parts relative to thedrill pipe comprising segmental rings presenting knurled surfacesengageable with the drill pipe and threadedly engaging the body.

5. A reamer comprising two body parts `ningely-connected together, meansfor drawing the free ends of the body parts together into clampingengagement with the drill pipe, reamer cutters mounted upon said bodyparts, means ici-preventing rotation of the body parts relative to thedrill pipe comprising segmental rings presenting knurled surfacesengageable with the drill pipe and threadedly engaging the body, thethreads on one ring being opposed to the threads on the other.

6. A reamer comprising two body parts hingedly connected together, meansfor drawing the free ends of the body parts together intoclampingengagement with the drill pipe, reamer presenting interior knurledsurfaces engageable with the drill pipe and exterior surfaces eccentricwith respect thereto, said exterior surfaces being engageable withcomplementary surfaces on the interior of the body parts, the body partspresenting surfaces adapted to engage the drill pipe.

7. A reamer comprising two body parts hingedly connected together, meansfor drawing the free ends of the body parts together into clampingengagement With the drill pipe, reamer cutters mounted upon said bodyparts, means for preventing rotation of the body parts relative to thedrill pipe, comprising segmental rings presenting interior knurledsurfaces engageable with the drill pipe and exterior surfaces eccentricwith respect thereto, said exterior surfaces being engageable withcomplementary surfaces on the interior of the body parts, the body partspresenting surfaces adapted to engage the drill pipe, said rings beingwedge-shaped in section.

8. A reamer comprising opposed body parts adapted to be fastenedtogether in encircling arrangement around a drill pipe, each part eX-tending from top to bottom of the reamer and providing supporting meansat top and bottom for cutter pins, cutter pins carried by each part,roller cutters rotatable thereon, and means for locking the partsagainst rotation on the drill pipe.

9. A reamer comprising opposed body parts adapted to be fastened inencircling relation about a drill pipe, a cutter mounted upon each partadjacent the top and bottom thereof, the cutter-supporting means foreach cutter being integrally connected.

10. A reamer comprising opposed body parts in the form of a segmentalsleeve adapted to be fastened together in encircling arrangement about adrill pipe, each part having upper and lower cutter supporting means,cutters supported by the cutter-supporting means, the upper and lowercutter-supporting means being integrally connected.

l1. A reamer comprising opposed body parts forming a segmental sleeve,means hingedly connecting the segments of the sleeve enabling them to beopened and closed so as to be positioned in encircling arrangementaround a drill pipe, means for fastening the swinging ends of thesegments of the sleeve together, upper and lower cutter-supporting meanscarried by each part, cutters supported between the upper and lowercutter-supporting means, the upper cutter-supporting means being rigidlyconnected to the lower cutter-supporting means independently of thehinge and fastening means.

OTTO HAMMER.

